Nissan Frontier D22. Instruction — part 362
FUEL PUMP CIRCUIT
EC-551
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) connector M31
●
15A fuse
●
Harness for open or short between fuse and fuel pump relay
>> Repair harness or connectors.
4.
CHECK POWER GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3.
Check harness continuity between fuel pump terminal 6 and
body ground, fuel pump terminal 5 and fuel pump relay terminal
3.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors C1, M67
●
Harness for open or short between fuel pump and body ground
●
Harness for open or short between fuel pump and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK OUTPUT SIGNAL CIRCUIT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 11 and fuel pump relay terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F36, M81
●
Harness for open or short between ECM and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
SEF334VA
Continuity should exist.
EC-552
[KA24DE]
FUEL PUMP CIRCUIT
8.
CHECK FUEL PUMP RELAY
With CONSULT-II
1.
Reconnect fuel pump relay, “fuel level sensor unit and fuel pump” harness connector and ECM harness
connector.
2.
Turn ignition switch ON.
3.
Turn fuel pump relay “ON” and “OFF” in “ACTIVE TEST” mode
with CONSULT-II and check operating sound.
Without CONSULT-II
Check continuity between terminals 3 and 5.
OK or NG
OK
>> GO TO 9.
NG
>> Replace fuel pump relay.
9.
CHECK FUEL PUMP
1.
Disconnect “fuel level sensor and fuel pump” harness connector.
2.
Check resistance between terminals 5 and 6.
OK or NG
OK
>> GO TO 10.
NG
>> Replace fuel pump.
SEF724Z
Conditions
Continuity
12V direct current supply between
terminals 1 and 2
Yes
No current supply
No
SEF511P
Resistance
: 0.2 - 5.0
Ω [at 25°C (77°F)]
SEF846Z
FUEL PUMP CIRCUIT
EC-553
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
10.
CHECK INTERMITTENT INCIDENT
Perform
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Removal and Installation
UBS00DDG
FUEL PUMP
Refer to
FL-6, "FUEL LEVEL SENSOR UNIT AND FUEL PUMP ASSEMBLY"
.
EC-554
[KA24DE]
POWER STEERING OIL PRESSURE SWITCH
POWER STEERING OIL PRESSURE SWITCH
PFP:49761
Component Description
UBS00DDH
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.
CONSULT-II Reference Value in Data Monitor Mode
UBS00DDI
Specification data are reference values.
SEF351V
MONITOR ITEM
CONDITION
SPECIFICATION
PW/ST SIGNAL
●
Engine: After warming up, idle the
engine
Steering wheel in neutral position
(forward direction)
OFF
The steering wheel is fully turned
ON
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